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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2612f5ee9d69bfd406dd4360581491a816377070eca2bbdf263afd2f1d8a001d' 
  AND token = 'sMK5YoTb6aowy4xDl2gPNJcaTA/BHCkXA3nPY/dkRDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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