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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6d9a62420dd5df8ac2ab38bcf5ec34ee3ce571b149acd509eb493ae019bd9d' 
  AND token = 'eG25thqHGxyIU09k5O1wtpE8cEEbbgja5xIG+SjVqlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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