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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6d90bb96b0cf481e3f76af42d172322d0f5a405385500432237f9dfc20a463' 
  AND token = 'L3gRAf58pHhqTg2rRnbVWrMRj7c9qz9Dx1Q97vn+RAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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