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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f432079549adba24a9e41c8d983ece4f0729f013e491fd95915e7946907c739' 
  AND token = 'ngCyUMIrkcmzxdo/z6tg/INiIY+uoj0/K2em5vEYn/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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