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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b23e71d2447e4ddf00bbbc812f8fc7c506af36d008820a2dbf98134fa07088' 
  AND token = 'GMbnGqdV8XQWlPRLn27wEe8u7GB9Hw7ivczPUyxfsuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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