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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1040050f9c4916dfacfb903f4d6e6a1251d01a87b9dd564b85242a42b63202b' 
  AND token = 'aCqNBnuvCB0fGb7QT6c+VO4Q1zdSAMIkFP4TMQvCQg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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