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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63190db043ce836c2dc3b93cb4b1d963ade6e1c0414b312a194c5bccfd867e3e' 
  AND token = 'K71IVeYI0r1H+tH1QaJgu0v11w13IHbeYS1IkImfh+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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