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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eeb0ba1350af8d58e7bd36444b5a3e5128ba1ca4765df2c27ff4ec59b23a65b' 
  AND token = 'UrOp4n9BOFxMIUmWeSRyXROXT9xWivMgBL+qMFf+xRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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