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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3450e3a3f0cab590442487cff9b44791749211ea4aea66c09a6913e46303e4b' 
  AND token = 'l2gcSJmjTnU+vUAM5paiW5y22a6TuBtzA9eQ488i8/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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