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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9b515e94dc23526a296e6c6ed1f385692da4c3cd934f2a3556477dea4c8e37' 
  AND token = 'Lp7cm+JOG6wBdrFnkXy9GQkK4JTAy+MYcknPrKpP7UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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