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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae649760957bed68513f45cc151d8c8a219b8c18aa972da7d44c6f638592a3e' 
  AND token = 'sPo/ZI4yHl9ZpX2iyiBLUZzTya90sJo6WCpD8QYm9iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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