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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df43b53c8ed36b55b574a85e1543b4637a6532f9ebc57536dac8f3d84c56e8d5' 
  AND token = '5lur7msNw0uRQVgBwUoCfeAvtFHGFJZipNvA77UPYYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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