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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9b472a43dd00cd8aa6965c2eb4ee32ef4cd15f6709edd697009822b362104e' 
  AND token = 'KrecD6tCKs/HqnTvok1znJ6LWY6KXEmdIOGkK9+/m54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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