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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455077fe3e306fed87cdfd57db13bb3e64665bcc0759b8ccba6beaf7860bf5ee' 
  AND token = 'J7qRrp/8Mn/BbEqXNxdicv/XYL7+nm6AvrhLxKFn07E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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