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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56e21c77b63ab86d548cc1636d32004065914dceb71c3ef2273fe50c471f08d' 
  AND token = 'wRYdkhWZ/dVGrpG/2j3a50PSeEuBxiT0iHOZM5+gB8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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