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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505f5b2325a2b5989a8ad875434845d25d15b8c3629fe13ca35896ae2a0416d6' 
  AND token = '/3pesgee3rxg7/3HXB0O2FHpm6MD3yPErTnD1XNLDGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}