SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13784d7edd89cf2539f7565012bafc7c0ed36abb36bf3d345cae4e955b24aaf' 
  AND token = 'RtEhvEVDGkg7ZF02Qdrmb7DL0qk5+UpmlG+KO0/eoEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

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