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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935b56b6df2aed36894818733dabc2d807c7aa5ecc1f6cc3b5f74e57ef606494' 
  AND token = '6SyhjvHBXd4JaCeRz0N9K8AIXwrHZDThfQ5d92TKNro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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