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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87c4e6b5ab875a518a870f696b7eab48af7cb5c0a1ba7fba94bfec4e8ee63ea' 
  AND token = 'UJhRUs2U8VyVaEl73KYw0jKp6RtZg49WXkjqYpSJR04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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