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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11852beb83765fd5a24b0bb78081cad9ae9a1629b7018b76e0b2585a1fd5a060' 
  AND token = '81U8uRMvnQXtRLgdYcR/+NuEH8XEEVlgEjviO/Xscgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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