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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa10fa35b675e48244501109ad83b42b824a00ca1307ad8846a8b6e4d99560e' 
  AND token = 'I0G2V59Bf1OL09n7FWzs6L7ZJqAMr2gHlD9/kyqsuOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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