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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417a5eec335d7acfb9935173958928b0fd4adfcd407b914b6cf9a5acb201bc9a' 
  AND token = '9HbkO00X6fIq070nRx18b6rped4vjr0nqlHIsTy0tsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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