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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f78a8122e042b8884142c1838a7fc2bc67d16c64d91fd45b5046b5e15375cb' 
  AND token = 'h9eIBFrErldae6VNa1z/o2FPCt+m1X8Hdh5x0r+wuQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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