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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884c5cfad528081ed1ba5b3f6fc697326c29bfb6c7e9eef137d33e32c1d4dc83' 
  AND token = 'eJ/nkX6knfh2NnLZf8nCGothrr1NcUUv/PzwCqN/vVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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