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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810d4f6cb4c4a2d31900ddae4b26342d9550ab8c348020fa9d9084cfd15f9d14' 
  AND token = 'fFUnf5+TfhxYxBpeQ75wr3TNyJw/4Ncq5YSQt8kAnsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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