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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c566f0ad882de951a1a29ded64be0fc33cfb6819a1f714269c91eef1de7407e9' 
  AND token = 'TnVkTI1hKf0vQEhd3d2IJaYydg2g0Lxvaje5+ZEiPdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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