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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0d80ecb1e17eb2653342e7e2fbb1a915e361e6ae74ca5415d1d2a9d44bcb9d' 
  AND token = 'B5B4GX8XJLxt5VaxLGqfVpoaPJVbI6sqsSHJcqKN5Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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