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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a3c9b6f860a0da7c9e4d00a985665a496a93ecf3e108eafc81f7271d0d9314' 
  AND token = '4PeFmn7xgbrPljFCyP77QETE/4+H2Z2MNLzm+DjTGQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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