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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a944d2a26b540166b811f49e822efd07d52e29f1d926a06092b2671e47f3cf3b' 
  AND token = 'Rkzt55WU7Jd3zHPbbsi9BXqcAFfta40Psxjh5Fzdp3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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