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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b715bd305556d622dfa75f8301ea795c3949cabf0ced48596f7585137d55d5' 
  AND token = '1VF8f9Jp/CkzmOLk8BtCDueixua6EDeKd/ViaSGjgOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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