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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd3fc10111d30196e7ecc76c046d2c4948cbea10eb5494d90a9ea6370c0279a' 
  AND token = 'qaHS86VjT5UInrwi7mMIzd9apOI38ZcQj9TjD+SXDmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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