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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563dd9011193075c783be77684331319a9f4a601b329dc7b3efdbebd6d7a3dae' 
  AND token = 'pFrrLvmhdHnVjHb4Z8rFekqeL2vABkX3A5j6teZGPu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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