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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36a159ceadcf22d29fac6917c1aa4f7c8061ed45e1acb6e3b9a1ac5244b4785' 
  AND token = '5K0dOIK6Rc0c2uQ1KSWXAFYevZV3NNnYn1HIgzXhqgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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