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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468d48fd16aac76ada88d093f1c2870ad388c2f730572b2b5df28a9c6f63c749' 
  AND token = 'Vz3oNd4fydwckEO1oi5h130HDlJtxi0lwgdn1j2ErXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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