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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25bdf1bd7414317ec864a8dd8fadae2486ff62ac946c5de2480b3503798649f8' 
  AND token = 'FPo5mw2geZ7G3hH2eIdsDqXRsGUfbvmaIkETc0DGuXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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