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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574f06834c4df12aaa7203732b79e7b5c98e77a99b59905ab538d5fef3cf6758' 
  AND token = 'YVfCZmLRNEywe9evu6/WtW2HPJeYz8QLjButPO2uSFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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