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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1114640b6407e822ac52bbe486aa9bc625dd6aaf4b5f75e828f0f10f1a716f1' 
  AND token = '55L7C2ccaDB4RIsSL197cTi3sWcmq246NlYkj/KASWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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