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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b6f64b37f6f3893fb891660993960e9ffdc1d91f36fbd5acbbbec2ebc7df34' 
  AND token = 'L9YquD/urBeRlRP0N9CjDl5jCJwlFbqc/jGbRVoD3Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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