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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca02785071ec2a768c60e784df07927c1c7703e17b49a432cad340a4e2b9fbd9' 
  AND token = 'gueeP4EoAYCz1ob5j8VG+33zanZ+oQFLJQbnvJx+GJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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