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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8021ee34d26d2c67ce6fa1ab67014fd3c4443f2f6cdbe9536e8f7b68526c43c' 
  AND token = 'zsUSkeIDu1NFmtURAfTcfhlhkDeZ26T/jqKFbGxHpX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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