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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd63434bc7f51f5b65f6d7eaae230e407a32ebc30b01d31c50ac76a6cc853de5' 
  AND token = 'ZFclYPMh5JU3n5zF1Nb6eGo73432maFguWWlwHkcZ9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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