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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f168be1b1551094f536d0c739ccb0e064222883345eaa1064b448a3394e091d' 
  AND token = '89ogByKsvPO4trZKej1cydK3h4Z9DrfnVhD45WITp4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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