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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592c89b7fabdbfc88e0c4e450f4a6e71252394feffe06c1792ee1f1db73b0ad5' 
  AND token = 'DbfFQP5YtV73B0Hy0198cD9mmSwt13lJjAlLnwDU/Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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