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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd77d04849fbda9dd9b8fea4484be65def35eab8f8566d16a6eeef813a80800' 
  AND token = 'TguZJNkE3tmwLxgv070yds5osK4+32hURl+bgtxihoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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