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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60c0a2173214e70bf3e37d213301a3e51b81b248521bca516635bba67a8898d' 
  AND token = 'IN3GeSpTF0f/hf01+TldXEfbTiDOA5IOhX5K/JN87EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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