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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9a29830224e1de56c5ef13af3743e59670735fb4c40e8021f9b391fffb8134' 
  AND token = 'suMU7M7hLfgbkMNcdO2UJheO5zORuHHdc+UZTPhmRPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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