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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286f10c4f454f3702a20c6ac1e27224939b42479f80d22e4221bee30e8b36b86' 
  AND token = 'L0pGEUSq0jtuI3CDFmsxn/U87Id/YVlgNfEcAjJ06uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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