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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605ef85a44af2548248300318df7c06feadac10c91d27a87bad62002420a3d8d' 
  AND token = 'uf+UUNMVNVj5jxuf5iCJ9deCg98oJdj//s3jXkTF5DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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