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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82572e40784faa2f5fc27682df0100d05f051233c0a5fdab06ef968d2ad73ae9' 
  AND token = 'BJngLr23+MA0lsg91JpiMi2+K1I9WXw/ZHykJGfqLR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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