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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2830b5ff356eab8d110ca3060f6f59e5f11d3fc5d2dfc481202e5adcec726d9' 
  AND token = '6UmzriPsBgovwcl53l7rLrvtEr2s/lUTauCgUCSkqIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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