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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a552c7c26a5c5af82430e0d4fad19b65130011c68160cf3628339e5c143118fb' 
  AND token = 'rvOo2aw4OJdWq/ZFqgc5dTsH7NBGc0ZrLokEo5yUXzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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