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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfd55ecdc57f266957d7d56c20679509f385de2bbaf11f809c3c50ecfe7d964' 
  AND token = 'Qmy13dH4m1LE6yvtXL8F9TOkpc9+e6ByTE07vD/loX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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