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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320c1712d17be3cbb2a4c573b6c1ee89a51ce7b42152da86a3c46a89ceb24eb7' 
  AND token = 'BkKF8sB5kRaovd9M4JTrAaGrcHy4ONxMlR7qgex0YLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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