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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd074f4d3b1dc7af5a8d4e5ab249b90ac14e7aee1a2e6371c4ff289597ab97b14' 
  AND token = 'B6qugZV/4ai0D9PkVObnTzEXrZhXhJWGyM5niRv0pAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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