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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998d8b865c209051ae90f9ce1c450022aa7c5c866b06c848d09abbd175a5f39f' 
  AND token = 'BSKjv1T6rwb2nZJatAV+tmdXhLdmLvXjOltjOCLicBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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