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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3f018009f3ca76b9fec1f3fabe32020005c4357a18ec13db19e1ee465f4a89' 
  AND token = 'mzGk8IV76mDPg5nuEYDCjkGuxybeyI/q2WrMQuW6WM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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