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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95100d8d7558e0cbd01ffd7263d270ed1dd64975a2a7bad654fd7bab45e28531' 
  AND token = 'aH06W5f8hc4Hphm9gFPBbH4fDzaVSGBNbRFyMQ5fHqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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