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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7fc7f3e69aa5ab567e0f2f621fe928f2fd16808f72b46ae42424ac39edb805' 
  AND token = 'Q4S8I2sUqXp5Omy7WlUGwvv0U8r8LiICu5J4XCi5csA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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