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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fea2a6a42d846ed4f7cd4a218758c1d59ad0f77820683a41f990d942bc4eb1e' 
  AND token = '3qITVDC7/SaaW0e5dYipPaqoMQbq2MMkL2MCooTgb44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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