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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec8ea7379aca305f2d94b228a7e52310a59fe83498ce07db16e6f27920299b7' 
  AND token = '8jMQyAXOh2w3ahreDK+fhphkQd5jCXC8Ap4/rqGk2Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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