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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518317cbc9338ce2166d55b81d6fd976b7a92ccbddbb0a5714c638271a4bbddf' 
  AND token = 'r0uLxHkuyLFnrHdB+PNlFbscsEd2Buz5GQzLEhijmpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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