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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f1e83be264823e27960b42102bc59e9866eaf2ce3206d9d4e093f400e3ef54' 
  AND token = '5EBUmFnGI9f+GslCDqKq43u5ECfBjrzVCkX031r41A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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