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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9229e224b6b6c661f0b25f063b8571464236de75df11c266b4a98bf64902acb' 
  AND token = 'T/XwSWIJQl6v1O5Vord+DQeiO+U6cLR6iQHOMJzNXkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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