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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a205a0860ea317bf65a7e821c296d456359fd7d25de017d06a722bc9dc536e' 
  AND token = 'ooyuXbXMYLM/BkSsxsBrnZ5PHIf9LBHmb8EVs2rBQIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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