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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e79d86ea850a16ebf176f4ab4e519e8eee23c86d9cf6cbcff6d5bc3dc14b4ba' 
  AND token = 'lpTHnpkQu2fL6+AmauVq0iBbuFXL6QygmaHVStXMim4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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