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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff650113884f7053c315bcce9facc370399d0495bf3f30c56d468a8026e7e6d' 
  AND token = 'TUQEUTfGaehLMe5K8QJ/dA6dA3KLlx7vQ8MGL02kY1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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