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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5191758ef1422605c87d33a5cbae0e3f7fc1e94741332b787da66ae84161313e' 
  AND token = 'Bp0cnXTw//HUQnIX+cW0qsck7YmhZ6ikHbUtE1W5Kzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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