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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383237a3b767324605b419846bc9c6a428f570f84f40a899fc032f976098e64b' 
  AND token = '92uXl3J4PCGJi73TRW21r1A0SNSJg4Ft/cLvAuv0Af4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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