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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaf16f5852fed76c73886ab839008b35cd4372458cefd1620a9587830de3377' 
  AND token = 'O0OpqKI0E0KXt0oFIWFkfZaIjNHuxWknyk8MNZIadOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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