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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b290927588d712e6da9e28b3c75ce98de8a8accc9b63b85649d5b9e57310fe80' 
  AND token = 'qoXJiK1o9/Rh6OkWJz+DZeqfdYXrzGsx08XGieQ09OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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